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Finding the Fourth Proportional to 12,129.64, 18,168.06 and 7,435.44

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Solution

The fourth proportional to 12,129.64, 18,168.06 and 7,435.44 is: 11,136.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,129.64 : 18,168.06 = 7,435.44 : x
  2. Step 2: Convert to fraction form
    12,129.64/18,168.06 = 7,435.44/x
  3. Step 3: Cross multiply
    12,129.64x = 18,168.06 × 7,435.44
  4. Step 4: Simplify right side
    12,129.64x = 135,087,520.05
  5. Step 5: Solve for x
    x = 135,087,520.05/12,129.64
  6. Step 6: Final answer
    x = 11,136.98

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.